Cord Blood Umbilical Cord 3

Question 1

Cord blood stem cells used in transplantation are primarily derived from which cell lineage?

Accepted Answer

Hematopoietic stem cells

Answer

Hematopoietic stem cells (HSCs) found in cord blood are the main therapeutic cells used to reconstitute a patient's blood and immune system.

Question 2

After the umbilical cord is cut, the segment attached to the newborn dries and falls off within approximately:

Accepted Answer

7–21 days

Answer

The cord stump typically desiccates and separates within 7–21 days after birth.

Question 3

Which of the following best describes the blood flow direction in the umbilical arteries?

Accepted Answer

From fetus to placenta (deoxygenated)

Answer

The two umbilical arteries carry deoxygenated, waste-laden blood from the fetus to the placenta for exchange.

Question 4

What is the average length of the umbilical cord at term?

Accepted Answer

50–60 cm

Answer

The average term umbilical cord measures approximately 50–60 cm in length.

Question 5

An unusually short umbilical cord (less than 35 cm) may be associated with which complication during delivery?

Accepted Answer

Placental abruption at delivery

Answer

A short cord can cause traction on the placenta during fetal descent, leading to placental abruption or cord rupture.

Cord Blood Practice Test